This timeline includes school shootings at K-12 educational sites involving students or staff as perpetrators or victims since the December 2012 tragedy in Newtown, Connecticut. Incidents in the timeline all involve a gun discharging live ammunition, but those fired by police are not shown. The data for the timeline was primarily drawn from gun control advocacy group Everytown for Gun Safety, and crosschecked against news reports.

See the timeline at Al Jazeera America …

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